Abstract
We investigate the absorption of planar massless scalar waves by a charged rotating stringy black hole, namely a Kerr–Sen black hole. We compute numerically the absorption cross section and compare our results with those of the Kerr–Newman black hole, a classical general relativity solution. In order to better compare both charged black holes, we define the ratio of the black hole charge to the extreme charge as Q. We conclude that Kerr–Sen and Kerr–Newman black holes have a similar absorption cross section, with the difference increasing for higher values of Q.
Highlights
The validity of general relativity (GR) in the regime of weak gravitational fields is unquestionable, since it was extensively tested and verified [1–3]
We focus on analyzing the absorption cross section of planar massless scalar waves by a KS black hole
The dynamics of a massless scalar field Ψ in KS spacetime is described by the Klein Gordon equation, which can be written in a covariant form as:
Summary
The validity of general relativity (GR) in the regime of weak gravitational fields is unquestionable, since it was extensively tested and verified [1–3]. In the last decade, following suitable technological advancements, tests of gravity in the strong field regime became more recurrent Observations such as the first detection of gravitational waves (GW) by the LIGO and VIRGO collaborations [4] and the recent results of the Event Horizon Telescope (EHT) collaboration [5] made an object stand out as the protagonist of these experiments: the black hole. Scalar fields stand out as the simplest proposed candidates to explain some issues in physics, as, for instance, the abundance of dark matter [27] and the strong-CP problem [28,29] Related to the latter, some attempts suggested the axion hypothesis to elucidate the recent reported results of North American Nanohertz Observatory for Gravitational Waves (NANOGrav) collaboration [30,31]. We address the problem of the absorption of fields by a charged rotating black hole in the context of heterotic string theory.
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